Correlating Standard Penetration Test and Dynamic Probe Super Heavy penetration resistance values in sandy soils

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Correlating Standard Penetration Test and Dynamic Probe Super Heavy penetration resistance values in sandy soils

Mensagem por Manuela » 05 Set 2016, 11:17

Autores: C MacRobert, D Kalumba, P Beales.

JOURNAL OF THE SOUTH AFRICAN
INSTITUTION OF CIVIL ENGINEERING
Vol 53 No 1, April 2011, Pages 46–54, Paper 754.

Abstract:
This paper presents a statistical method used to develop an empirical equivalence between the
Standard Penetration Test (SPT) and the Dynamic Probe Super Heavy (DPSH) in sandy material.
Penetration resistance values from the two tests are often taken as equivalent for design purposes,
as the same drive energy is used in both. SPT and DPSH resistance values from different geological
depositional and weathering environments were examined. The data came from the following
areas across southern Africa: Matola in Mozambique, Gope in Botswana, Umdloti and Cape Town in
South Africa, and Illha de Luanda in Angola. It was apparent that energy losses were greater in the
DPSH test than in the SPT, leading to higher resistance values in the former. The SPT is carried out
within a borehole, whereas the DPSH is continuously driven into the soil. The dynamic force applied
to the DPSH rods causes soil to fill the small air annulus around the rods, exerting a frictional
resistance. The different geological settings of the test sites revealed that, although different factors
cause the friction, the equivalence varied in a similar manner. Hence a single correlation formula is
suggested to determine equivalent SPT values from raw DPSH resistance values.
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